If you're using an Apache Karaf 3.0.x based system (such as Aetos 3.0.2), you can install this MileStone release using the following Karaf console command:
install -s mvn:com.savoirtech.karaf.commands/ctop/0.2.0.M1

The metrics table is of particular interest, providing live updates of ten tracked attributes, including:

ActiveThreadCount,

CompletedTaskCount,

CurrentQueueSize,

CurrentThreadPoolSize,

LargestQueueSize,

LargestThreadPoolSize,

MaxQueueSize,

MaxThreadPoolSize,

RejectedTaskCount, and

TotalTaskCount.

These values are obtained from MBeans provided by the OpenDaylight controller. The Karaf console provides the mechanisms to allow users to view these metrics without having to use additional external tooling.